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Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Postretirement benefits $ 122 $ 135
Intangible assets (2,110) (2,186)
Investments in non-US subsidiaries (223) (224)
Fixed assets, net (140) (55)
Inventories 111 126
Foreign tax credits 343 118
Other, net 456 436
Net deferred tax assets (liabilities) $ (1,441) $ (1,650)